Fuel Injector Cleaning and Flowing Process
At Boost Lab of Tampa we service all types of injectors, side feed, top feed, and the vortec type. This includes gasoline injectors found on cars, motorcycles, lawn mowers, and boats.
The injectors are placed on an ASNU flow bench for their testing. Then, their parts, such as: pintles, seals, and filter baskets, are disassembled, using the tools designed for such purpose. Subsequently, the following tests are performed:
It consists in checking for any leaks through the pintle, or the injector’s body. On the flow bench, the variable pressure regulator allows to adjust the system’s pressure to the vehicle’s own.
Spray Pattern Test
As its name suggests, it consists in examining the fuel’s spray pattern. The flow bench’s control panel has options which can simulate the injectors’ performance as if they were fitted to the vehicle, thus allowing for a more accurate testing.
It consists in measuring the fuel flow delivered by the injectors to the engine, allowing to check eventual flow mismatches. The simultaneous testing of various injectors may be performed on a good flow bench, thus allowing for more precise comparisons.
It consists in testing the injectors’ performance under different operational or functioning conditions.
The results of such testing shall determine whether the injectors should undergo the ultrasonic cleaning process.
The ultrasonic cleaning process destroys in just 10 minutes all the crystallized particles and contaminants located inside the injector, which block the adequate fuel flow through them, thus restoring their normal function.
Flow Test Before Service
Flow Test After Service
Spray Pattern Before Service
Spray Pattern After Service
Ultrasonic Cleaning Process
After the injectors’ ultrasonic cleaning, they must undergo once more all the previous tests. Once they are correctly adjusted and calibrated, they are reassembled with a new set of O rings, pintle caps, filter baskets, and spacers where applicable.
WHY SHOULD INJECTORS BE REMOVED FROM THE VEHICLE AND BE SERVICED?
While fitted to the vehicle, it is not possible to check the injectors’ functioning; therefore, they should be removed and placed on a flow bench.
The injectors in the picture show abnormal fuel spray patterns, which can only be examined on a flow bench. Even if a vehicle may perform fairly well with these injectors, actually its engine may idle improperly, cylinder-to-cylinder fuel distribution may be irregular, and the abnormal spray pattern may cause pistons and valves to carbon up, thus damaging them.
Therefore, these injectors should be serviced in order to restore their correct spray patterns, since this ensures a proper combustion. To achieve an improved engine performance, fuel economy, and suitable driveability, a correct spray pattern is not an option. Proper fuel atomization is an essential in any internal combustion engine.
Technically, it has been proved that a debris build-up inside the injector measuring a mere 5 microns may reduce the fuel flow by 25%, that is, any debris inside the injector may affect the fuel flow, change the appropriate spray pattern, producing improper exhaust emissions, an increased fuel consumption, and a poor engine performance.